Adjustable thread shaper



Aug. 2s, 1924.; 1,506,027

F. O'BRIEN ADJUSTABLE THREAD SHAPE Filed May 19. 1923 Patented Aug. 36, 1924.

UNl'iE STA'IES .FRANK OBRIEN', OF CANTON, OHIO.

ADJUSTABLE THREAD SHAPER.

Application filed May 19, 1923.

T @ZZ whom 'it may concern.'

Be it known that l, FRANK OBninN, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have. invented certain new and'useful improvements in Adjustable Thread Shapers, of which the following is a specifioation.

The invention relates to a tool for restoring or cleaning` damaged threads on pipes, and is especially applicable to use in the oil fields for reshaping or restoring damaged threads upon sections of well casing.

The objects of the invention are to provide a simple, strong and durable tool which is readily ladjustable t0 fit pipes of different diameters, and which is easily operated and eiciently reshapes or restores damaged threads upon various sizes of pipes.

Other objects are to provide a tool of this character provided with rotatable disks having beveled peripheries provided with milled or file surfaces for reshaping the threads, the disks being mounted upon shafts inclined at a slight angle to correspond to the angle of the threads, means being provided for rotating the disks as the tool is rotated around the pipe.

The above and other objects may be attained by constructing the tool in the manner illustrated in the accompanying drawing, in which- Figure l is a plan view, with parts broken away, of a tool embodying the invention;

Fig. 2, a section on the line ,Q -2, Fig. 3, Fig. 3, a section on the line 3 3, Fig. 2;

and

Fig. 4, an edge elevation of one of the cutting disks upon an enlarged scale.

Similar numerals refer to similar parts throughout the drawing.

An open frame l preferably of circular shape. is provided with the diametrically opposite pockets 2 upon which are formed the tubular handles 3. rlhis circular frame is of slightly greater diameter than the largest size of pipe upon which it is intended to use the tool.

An adjustable bon i is mounted within each of the pockets 2 and provided with the internally threaded thimble 5 which. receives the threaded extremity 6 of an adjusting spindle 7, which is rotatably mounted within the adjacent tubular handle 3, and provided with a collar 8 at its inner Serial No. 640,069..

end and a knurled head 9 at its outer end, by means of which the same may be rotated t0 move the box 4 longitudinally within the pocket 2.

A case 10 is received within the open end of each box 4, the rear end thereof bearing against the shoulder 11 formed in the box, leaf portions 12 being provided upon the sides of the case for frictionally engaging the boX. The outer open end of the oase is cut away in an arc as shown at 13, corresponding to the curve of the circular frame 1, the open end of the box being similarly cut away as shown at 14e.

A plurality of shafts 15 are journaled within each case 10, these shafts being slightly inclined as best shown in Fig. Q. Disks 16 are fixed upon the shafts 15, each disk having a beveled periphery preferably provided with a milled or file face as shown at 17, terminating in the flat, smooth, pe rip-heral edge 18.

The shafts 15 are operatively connected together `as by the gears 19 and a shaft 20 is journaled in each case in rear of the shafts 15 and extend up through a longitudinal slot 21 in the box 2. This shaft is operatively connected to the shafts 15 as by the gear 22 and pinions 23, and is provided at its upper end with a roller 24 preferably formed of rubber, liber or other suitable frictional material, fixed upon the shaft as by the washers 25 and nuts 26.

The rollers 24.- are adapted to frictionally engage the outer surface of the pipe or casing upon which the tool is being used, the disks 16 entering the threads upon the pipe or casing, reshaping the same and restoring them to their original condition, the file edges of the disks removing any portions of the thread which may be necessary to properly reshape the Same.

ln operating the device. to reshape the threads upon a pipe or casing, the tool is first inserted over the end of the pipe to the inner end of the thread and the spindles i" are then rotated to force the boxes toward the pipe until the disks engage the threads thereon at the lower lor inner extremity of the threads.

The disks being mounted upon the shafts 15 which are slightly inclined, thus line up properly with the threads, and as they are brought into frictional engagement. with the threads, the rollers 24 are also brought into frictional engagement with the outer surface of the pipe, and as the tool is rotated, the disks travel upward or outward to the outer extremity of the thread, and are continuously rotated through the gearing, connecting the same to the shafts 20, which shafts are rotated by the frictional engagement of the rollers 24 With the pipe. As the tool is moved to the outer end of the thread, it may be disengaged from the pipe, leaving the thread properly reshaped.

It is desirable to form the disks 16 in the manner illustrated, having the iiat, smooth, peripheral edges 18 in order to prevent cutting the threads deeper than they are originally formed, as it is obvious that if the thread Were out deeper than originally intended, the internally threaded collar or other device adapted to lit thereon Would not properly engage the threads.

l. A rethreading tool comprising an open frame, disk shaped members mounted in the frame and adapted to engage threads upon a pipe or the like, and a friction roller yoperatively connected to the disk and adapted to engage the periphery of the pipe for rotating the disk as the tool is rotated around the pipe.

2. A rethreading tool comprising an open frame, disk shaped members mounted in the frame and adapted to engage threads upon a pipe or the like, said disk shaped members being mounted upon inclined axes.

3. A rethreading tool comprising an open frame, disk shaped members mounted in the frame and adapted to engage threads upon a pipe or the like, a friction roller operatively connected to theA disks and arranged to engage the periphery of the pipe for rotating the disk as the tool is rotated around the pipe, and means for moving the disk shaped members toward or from the pipe to be threaded. p

4. A rethreading tool comprising an open frame, disk shaped members mounted in the frame and adapted to engage threads upon a pipe or the like, a'friction roller for rotating the disk as the tool is rotated around the pipe, and means for moving the disk shaped members toward or from the pipe to be threaded.

5. A rethreading tool comprising an open frame, disk shaped members mounted in the frame and adapted to engage threads upon a pipe or the like, said diskl shaped members being mounted upon inclined axes, and means for moving the disk shaped members toward or from the pipe to be threaded.

In testimony that I claim the above, I have hereunto subscribed my name.

FRANK OBRIEN. 

